Hot-blast downdraft-furnace



l. J. SMITH.

HOT BLAST DOWNDRAFT FURNACE.

Patentedsept. 7,1920.

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siren STATES JONATHAN J. SMITH, F DES MONES, IOWA, ASSIGNOR OF ONE-HALFT0 OSCAR F.

PATENT OFFICE.

PETERSEN, 0F' DES MOINES, IOWA.

Application filed March 5, 1919.

To ZZ y11i/tom vf?? muy concern.'

Be it known that l, JoNA'rHAN J. SMrri-I, citizen of the United StatesYof 'Americza and resident of Des Moines, Folklcounty, Iowa, haveinvented a new and useful Improvement in Hot-Blastv Downdraft-Furnaces,of which the following is a specilication.

rille object of this invention is to provide improved means forincreasing the efficiency of furnaces burning bituminous coal or otherfuel high in volatile'earbon.

My invention has for its further object the ventilation of a'room orcompartment adjacent to a furnace, whereby the foul air may be withdrawnfrom said room and passed through the combustion chamber of saidfurnace. Y

My invention consists in the construction, arrangement and combinationof elements hereinafter set forth, pointed out in my claims andillustrated by the accompanying drawing, in which- Figure 1 is anelevation, partly in section, illustrating the application of my improvenient to a furnace and adjacent room.

A Fig. 2 is a horizontal section on the indicated line 2-2 of Fig. 1.Fig. 3 is a vertical section on the indicated line 3 3 of Fig. 1.

The improvement hereinafter described may be employed, singly or inmultiple, in connection with any selected form of furnace, particularlysuch as may be used in heating a building by hot-air circulation, steam,or hot water radiation, and in this connection the furnace shown istypical of one form only. Y

In the construction of the devices as shown the numeral designatesgenerally a furnace or heater of the hot-air type and it may be of anydesired and suitable construction, preferably modilied in theparticulars herein pointed out. TheV furnace 10 preferably is linedthroughout its entire interior height by an overlay 11 of heat-resistingplastic material such as fire-clay and a smoke-discharge 12 is providedin said lining and communicates with a drum 13 having a smoke-discharge14 near the lower end thereof adapted to communicate with a flue orchimney, not shown, for draft purposes. Any suitable casing or jacketmay be used, a portion 15 thereof being shown.

The furnace 10 preferably is provided with a dome 16 formedwith acentral opening Specication of Letters Patent.

Patented Sept. 7, 1920.

Serial No. 280,893,

and a pipe 17 is mounted vertically in said uenmg and projects above andbelow said dome. A flanged collar 1S is fixed to the upper `surface ofthe dome 16 and surrounds said pipe 17 and the pipe is secured to saidcollar by a set screw 19. A conductor or conduit pipe 2O communicatesat-one end with the upper end of the pipe 17 andl at its other end islocated within the wall 21 of a room 22, such as a kitchen, and iscontrolled by a damper or valve 28 mounted on said wall. The admissionof air to, and consequent passage of air through, the pipe 2O iscontrolled entirely by manual adjustment of the damper or valve 23. Anozzle device is'mounted on the inner end of the pipe 17, within thefurnace and adjacent to the dome 16, and said nozzle device preferablyis made of metal by molding and is in one piece and imperforate exceptas hereinafter provided. rl`he nozzle device is constructed with acollar member 2st adapted to be screwed on the pipe 17 and a dischargecollar member opposite thereto, said members being joined by tubulararched members 26, in this instance eight in number, spacedcircumfcrentially thereof and joining and communicating at their endswith said collar members. There is no communication between the tubulararched members and the space between them, but said space or spacesaccommodate and permit the passage of heated air and burning` gases andflames c round and between said members to the end of heating the airwithin and while passing through said collar and arched communicatingmembers.

ln practical use the coal or similar fuel is placed on a grate 27,kindling` is laid on said coal and paper or shavings is laid on saidkindling; the damper 23 is opened; and the paper or shavings is ignitedin any suitable manner. Then all the doors and other draft devices suchas are commonly found in said doors are closed and air is drawn throughthe pipes 20 and 17 and the nozzle device to supply oxygen forcombustion within the chamber. As the combustion proceeds the coal isignited and releases volatile carbon, and at the same time heat envelopsand raises the temperature of the nozzle device above (SOOO F.Thereafter the air entering the combustion chamber of the furnace,through the nozzle device, and said nozzle device supplies substantiallyall of the air employed therein, is heated to a tem-` perature above600O F. to the end of comvmingling said air with theV volatile carbonreleased from the coal and creating a gas that will be consumed in thechamber and conserve the carbon, which 'otherwise might pass off,unburned, through the smoke fines.

The fuel supply may be replenished in any desired manner, such as by theintroduction of coal through the open fuel door, and.

and noxious odors from any place, such as a kitchen 22.

A Any desired modification of the arrangement and location of parts maybe made and I do not desire to be understood as limiting myself in suchparticular.

I claim as my invention- 1. A pipe adapted to be suspended within afurnace and a nozzle device suspended on said pipe, said nozzle devicehaving opposed spaced collars, one opening to said pipe and the otheropening to said furnace, and intermediate, wholly outwardly archedcommunieating tubular members opening at their ends only to said collarmembers.

2. A pipe adapted to be suspended within a furnace, and a nozzle devicesuspended on said pipe, said nozzle device havingy and including spacedannular collars, one opening to said pipe and the other opening only tosaid furnace, and intermediate, wholly outwardly arched, spaced,'tubularmembers between and communicating at their ends only with said collarmembers. i

3. A nozzle adapted for use ina hot-blast down-draft furnace, saidnozzle comprising spaced annular collars having a common axis, thespacing being on the line of said axis, and wholly outwardly-archedcircumferentially-spaced tubular members between, connecting andcommunicating at their ends only with said collars.

Signed at Des Moines, in thevcounty of Polk and State of Iowa, this 22dday of February, 1919.

` JONATHAN J SMTH.

